This is a high-performance replacement laptop battery for the Compaq Presario R4000-PL854AV, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 5.94 x 4.6 x 0.83 inches with an output of 14.8 volts. The chemistry is Li-Ion at 6600mAH capacity. Manufactured by Empire Scientific, model number LTLI-9025-6.6. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.